>I agree with that the docs are misstating the result of passing a memvar without quotes. The result of passing a memvar wihtout quotes is not always U. I this the data type of the thing in the memvar. I think the docs are rying to explain that if want to know teh data type of a memvar you must put it in quotes, if you don't you get the data type of the contents of the memvar, which can also be a confusing statement. But this shows what I mean;
>
>lcVar = "123"
>type(lcVar)
>
>the contents are numeric
>
>lcVar = "ABC"
>type(lcVar)
>
>the contents, that is a variable for field named abc is U
>
>lcVar1 = "123"
>lcVar2 = "lcVar1"
>type(lcVar2)
>
>the result is C because lcVar2 contains lcVar1 and lcVar1 is character type.

I just looked at the example, in the docs and it doesn't include this. Personally, I think that if this behavior is by design, including your samples (or similar ones) would partially help to clear up the confusion. I'd also like to see a bit of modification on the parameter description as well.